Malicious PDF — malware analysis report

Static analysis result for SHA-256 16fae47f674065ee…

MALICIOUS

PDF

67.9 KB Created: 2021-09-27 06:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7443b840a763c54278171aa13cb637ac SHA-1: 5d112c9a8675a31228c80d8f06de636b6fd44116 SHA-256: 16fae47f674065eef4f13469d4a2e4f54c6e09dd0428c37603aa872aab17c948
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further payloads or submit credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=watch+up+online+putlocker PDF link annotation
    • https://giltmorestukko.hu/ckfinder/userfiles/files/gilopagumibatusojuwepe.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a258c100b0eb9d1f3f5e0abacac6c953/tigawuxow.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/sosavatifozijoligusuj.pdfIn PDF document text
    • http://budka39.ru/files/jetewibomulowikotu.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/6526500960.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ebbcc29ba84cd23cdfa2227ff4cde980/dovonedesefubatajeg.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/sivexodiladulizara.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/zunuvew.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/871d301081da8b05be71bf1b5b267da8/dabesukenasam.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/giboxawuxatejoxekarove.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/nivota.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109072343509332.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/kibusi.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/suxiwi.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/7147103634.pdfIn PDF document text
    • http://csc0871.com/userfiles/file/20210927052941_g0021u.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/11587530304.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/kasixukitameb.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/65068650134.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/lakeson.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/24012477061.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000abb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABB6 10488 bytes
SHA-256: 64071934cc355e4e17e046b65e95ad131a7ea915b940727af6a2cca0fd879b25
font_01_sfnt_off0000c383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000db95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB95 15356 bytes
SHA-256: ac2bdff68580d9a77ccb652f4aeb9a0cb976d1cad7f830f290926d3b7833d301